Thank you so much for the information kuduae. Very informative. I'm a happy camper!
The firing pin nut on my rifle has been dovetailed to accept a aperture sight like the top picture. I have experience with bolt shroud sights as well as the aperture that is on my rifle now. I like both types but I do prefer the type thats on this rifle as it doesn't interfere with use of the safety.
I suspect that this stock was ebonized but the goo is also on metal components. The metal should be fairly easy to clean. I will need to thoroughly strip all the finish off of the wood.
I assume that this rifle is nitro proofed but I just want to be safe.